Unless you're counting things accesible to the mid to higher level players, such as a cleric character that happens to be around, there are actually only two factions / groups that can bring you back to live. The Morninglord, obviously, and the Ezrites. But the last option requires you to be part of the faction first. Everything else you named can only heal wounds, but there's many ways to do that. The main concern is that there's only one non-inconvenient way to raise the dead, which is the Morninglord church. Which in the case of most characters (everyone who isn't a follower or at least favours the Morninglord faith) means compromising your RP slightly, in exchange for mechanics.
It would just be nice to have another option to ressurect / raise dead (whichever is the right term), since not everyone knows a cleric of the appropriate level.
Anyhow, this isn't the topic ment for suggestions and I'm quite sure this suggestion has been made before. I simply thought it might not have been intentional for the Ezrite NPCs to only heal / ress faction members, as I personally see much more gain than any downside from removing the limitation. Hence why I posted here, instead of making a new topic about such a small change / unintended bug or whatever it is.
Feel free to remove all unneccesary replies / discussions as you wish.